
import re

text = '''Tom's email is tom@qq.com.cn,and Coral's email is coral@163.com. But I use 54345wz@qq.com.'''

regex = r'[0-9a-zA-Z]+@[0-9a-zA-Z.]+\.[a-zA-Z0-9]+'

email_list = re.findall(regex, text)

print(email_list)